KR102000193B1 - Modified asphalt binder and its asphalt mixture to realize internal lubricant and low noise characteristics - Google Patents

Abstract

The present invention relates to a modified asphalt binder to realize internal lubricant and low noise characteristics and an asphalt mixture manufactured thereby. The modified asphalt binder comprises AP-5 as a basic binder and couples AP-5 with a polymer material, thereby preventing lifetime shortening caused by cracks, plastic deformation and porthole generation of an asphalt paved surface, improving drainage performance while reducing the noise, and securing environment-friendly packaging technology through reduction in carbon dioxide generation amount and improvement in construction performance.

Description

[0001] The present invention relates to a modified asphalt binder and an asphalt mixture prepared therefrom,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modified asphalt binder and an asphalt mixture prepared therefrom, and more particularly to a modified asphalt binder for realizing anti-cracking and low noise characteristics. More particularly, the present invention relates to a modified asphalt binder, It has been improved to improve the drainage performance while reducing noise and reducing environmental impact due to plastic deformation and pothole generation, and to improve environment-friendly packaging technology by reducing CO2 emissions and improving construction performance. Modified asphalt binder and an asphalt mixture made therefrom.

While petroleum consumes most of its consumption, energy dependency is high at 27%, while dependence on energy imports is still decreasing, but it is still high at 93%.

In terms of environment, when fossil fuel is used as energy source, climate change such as global warming occurs due to greenhouse gas emission. The consumption of fossil fuel in Korea accounts for more than 80% of primary energy consumption, Is also increasing every year from 158 million TOE in 2006 to 195 million TOE in 2015.

According to the Ministry of Land Transport and the Korea Highway Corporation, traffic volume is continuously increasing with the number of vehicles registered each year in terms of road traffic, and the traffic congestion cost of the Korea Traffic Research Institute is also steadily increasing.

Excessive load and high temperature in summer due to the increase of traffic volume and vehicle cause rutting of pavement road and peeling due to water inside asphalt causes road hole such as pot hole.

In addition, traffic congestion and budget problems caused by road maintenance necessarily arise.

In the road sector, road repair costs due to plastic deformation, port holes, etc. were implemented from 2.2 trillion won in 2010 to 2.9 trillion won in 2016, and the amount is also steadily increasing, It is necessary to study eco-friendly low-carbon technology that can improve road durability and solve environmental and economic problems.

In addition, traffic congestion and budget problems due to maintenance of asphalt roads necessarily arise.

The percentage of pavement in the Road Status Statement of the Ministry of Land Transport and Transport is estimated to be 92.4% in 2016, and the unpacked roads of the provincial roads and cities and islands are left to some extent.

In addition, many of the national highways are still in the second lane, and the trunk function is insufficient and needs to be expanded.

Korea No. 10-2009-0129546 (Dec. 17, 2009), 'A composition of mesophilic asphalt modifier or mesophilic modified asphalt for the production of mesophilic asphalt concrete mixture' Korea Patent No. 10-1233006 (Feb. 23, 2013), 'Polyphosphate modifier for application to mesophilic asphalt' Korean Patent Registration No. 10-1166155 (Jul. 10, 2012), 'Middle Temperature Asphalt Modification Additive and Middle Temperature Asphalt Concrete Mixture'

DISCLOSURE Technical Problem The present invention has been made in view of the above-described problems in the prior art, and it is an object of the present invention to provide an AP-5 as a basic binder and to prevent the asphalt pavement surface from cracking, plastic deformation, Modified asphalt binder to improve the drainage performance while reducing the lifetime of the asphalt, improve the drainage performance, improve the internal lubricant and noise-reducing characteristics so as to secure eco-friendly packaging technology by reducing the amount of carbon dioxide generation and improving the construction performance. And to provide an asphalt mixture made therefrom.

As a means for achieving the above object, the present invention provides a high-temperature modified asphalt binder for use in a temperature range exceeding 130 캜,
25 to 32.5 parts by weight of low-density polyethylene, 30 to 37 parts by weight of EPDM, 5 to 8 parts by weight of EVA, 15 to 20 parts by weight of SBS and 8 to 12 parts by weight of SBR were mixed with 100 parts by weight of AP-5 ,
10 parts by weight of polyvinylpyrrolidone copolymer based on 100 parts by weight of AP-5, 4 parts by weight of 9-ethylcarbazole-3-aldehyde-N, N-diphenylhydrazole, And 10 parts by weight of boron nitride are further added and mixed together to provide a modified asphalt binder for realizing internal lubricant and low noise characteristics.

At this time, the modified asphalt binder used for the high temperature is mixed with a wax compound at a weight ratio of 8: 2, so that the modified wax compound can be used at a high temperature. The wax compound is prepared by mixing 15-23% by weight of paraffin wax, 10-15% by weight of PE (polyethylene) wax, 3-5% by weight of bio-oil, and the remaining toluene into a reaction tank and heating the reaction tank to evaporate the entire amount of toluene having a boiling point of 110 ° C .

Also, the present invention relates to a high-temperature modified asphalt mixture prepared by using the modified high-temperature asphalt binder described above, wherein the asphalt mixture containing aggregates satisfying the composite particle sizes of 13 mm and 20 mm is mixed with 100 parts by weight of the asphalt mixture, And a modified asphalt binder is further added in an amount of 4.4 to 6.5 parts by weight to provide an asphalt mixture made of a modified asphalt binder for realizing internal lubricant and low noise characteristics.

In addition, the present invention relates to a semi-high temperature modified asphalt mixture prepared using the modified high-temperature asphalt binder described above, wherein the asphalt mixture containing aggregates satisfying the composite particle sizes of 13 mm and 20 mm is mixed with 100 parts by weight of the asphalt mixture And an asphalt mixture made of a modified asphalt binder for realizing internal lubricant and low noise characteristics, wherein 9.5-16.0 parts by weight of the modified high-temperature asphalt binder is further added.

The present invention provides the following effects.

First, it meets the quality standard of existing asphalt pavement, and the production and construction temperature is lower than the conventional one by about 30 ℃.

Second, fuel savings result in a reduction in emissions of greenhouse gases and noxious gases.

Third, because of the low temperature construction, the amount of vapor generated at the work site is small, and the discomfort due to the smell is reduced.

Fourth, low - temperature construction can solve the traffic congestion problem because traffic opening time is shortened by decreasing road curing time.

Fifth, energy saving and waste problems can be solved at the same time.

Hereinafter, preferred embodiments according to the present invention will be described in detail.

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, embodiments according to the concept of the present invention can make various changes and have various forms, so that specific embodiments are described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

The characterization of the asphalt mixture largely depends on the optimization of the particle size composition of the mixture and the modification properties of the asphalt binder.

In general, modifiers used for asphalt reforming are physical properties such as resistance to plastic deformation, improvement of adhesion performance, and water stability through addition of a small amount of polymer with the HDPE, which is classified as rubber type and classified into plastic type, Were used.

As a part of this, although modified asphalt binder is used, most of the dry mix (Plant Mixed) used in Korea is manufactured by using CRM (Crumb Rubber Modifier) as a main material. However, Only the smell of rubber burning and the improvement of adhesion performance can be expected.

In addition, conventional quasi-high temperature asphalt modifier has been proposed as a foaming method and an organic additive method. However, PG 76-22 is known as the maximum limit in the performance test, unlike general asphalt modifier, and thus it is difficult to apply it to various special asphalt have.

Therefore, in order to solve such a physical disadvantage, a rubber material having better physical properties is discovered, and in order to improve the separation resistance due to aggregate separation, which is the most important reason for the breakage of the asphalt concrete, there is a disadvantage (EPDM) and Ethylene Vinyl Acetate (EVA) as a substitute for waste tire rubber powder to prevent the mixture from being damaged due to insufficient homogeneous adhesion of the aggregate. The performance of the mixture of oil-in-oil asphalt and low-noise drainage asphalt The present invention provides a modifier for modifying a modifier for modifying a modifier for modifying an asphalt mixture with a wax compound containing paraffin wax and PE wax in order to reduce the production temperature, There is purpose of.

Based on this background, in the present invention, EVA, SBS, and SBR, which can compensate the mechanical properties of asphalt, are added to EPDM and LDPE, which are known to be superior in mechanical performance, weather resistance and cold resistance to waste tire rubber powder as a main material It is intended to reform asphalt.

In other words, EPDM, which is used in various rubber products in industry and automobiles, is used as a polycondensation incineration material even though the amount of generated EPDM increases annually. However, EPDM is known to have superior mechanical strength, cold resistance and weatherability compared to ordinary waste tire rubber. However, EPDM is one of the recycled materials which is known to be difficult to recycle due to primary pollution by impurities and processing problems such as sorting and crushing.

In the present invention, low molecular weight polyethylene (LDPE) was selected as the main material in order to modify the asphalt and impart moisture stability and adhesion performance by processing EPDM in a powder of 100 MESH by freezing and pulverizing.

Low-density polyethylene is generally melted at a relatively low temperature of 110 ° C and is known to have excellent tensile strength, toughness and rigidity. EVA is an intermediate polymer of rubber and plastic.

In addition, SBR (styrene-butadiene-styrene) imparts elastic properties of asphalt and complements the deformations generated in the asphalt binder, thereby improving road breakage. SBR (Styrene-Butadiene Rubber) It has a feature to make the degree small, increase the softening point, increase the elongation, increase the viscosity at high temperature, and greatly improve the temperature sensitivity.

Therefore, in the present invention, an optimum mixing ratio is calculated using the above-mentioned materials to develop an asphalt-modified binder, and a wax mixture (Wax) is produced by reacting a bio oil with PARAFFIN WAX and a PE wax, Compound) is synthesized to complete the modified binder that can be used even at a sub-high temperature.

That is, the present invention realizes an asphalt-modified binder of the public performance grade PG 82-22 and a semi-high-temperature asphalt-modified binder by using recycled EPDM and a wax mixture (WAX Compound) Resistance and low temperature cracking property of the asphalt pavement, and preventing the damage of the pavement due to the plastic deformation and low temperature cracking of the general asphalt pavement, thereby making it possible to manufacture the durable asphalt pavement asphalt.

As a result, the durability of the packaging is improved in terms of economy, and there is direct and indirect economic effect such as reduction of the maintenance cost, reduction in human loss due to stagnation occurring in the road maintenance and air, and the like.

In summary, the present invention relates to an asphalt modifier which has excellent applicability in the field and is easy to manufacture in order to improve the resistance to plastic deformation, which is a disadvantage of the existing asphalt modifier, The present invention provides a method of modifying the physical properties of conventional asphalt through a plant mix type dry method and providing a durable asphalt mixture and a low noise asphalt mixture.

In addition, the present invention is characterized in that a variety of mixtures capable of being used simultaneously at high temperature as well as at high temperature by reacting a polymer substance with such a modifier are made possible.

More specifically, the modified asphalt binder for realizing the anti-freezing and low noise characteristics according to the present invention comprises 25 to 32.5 parts by weight of low density polyethylene, 30 to 37 parts by weight of EPDM, 5 to 8 parts by weight of EVA 15-20 parts by weight of SBS and 8-12 parts by weight of SBR.

The modified asphalt binder thus formed becomes a high temperature modified asphalt binder used at a high temperature.

Here, the high temperature in the high temperature asphalt refers to a range exceeding 130 캜, and the middle temperature in the middle temperature asphalt refers to the temperature range of 110 - 130 캜.

Particularly, AP-5 refers to a binder which is an ordinary asphalt (that is, a binder as an asphalt cement) and has an invasion degree of 60-80, 25 ° C, 100g, 0.1mm, PG 64-22.

In this case, in the expression 'PG 64-22', PG is the grade of asphalt binder as Performance Grade, numeral 64 is the average maximum packaging temperature in 7 days, and 22 is the minimum packaging temperature.

The low density polyethylene (LDPE) is melted at a relatively low temperature of 110 캜 and is excellent in tensile strength, toughness and rigidity, thereby increasing water stability and adhesion performance and ultimately enhancing internal resistance and low noise of the asphalt.

However, if it exceeds 32.5 parts by weight, it should be added at a lower rate because the degree of penetration increases, and when it is added at less than 25 parts by weight, adhesion performance is lowered.

In addition, the EPDM maintains homogeneous adhesion with aggregates and is superior in mechanical strength, cold resistance and weatherability compared to ordinary waste tire rubber. However, since EPDM is a problem in processing such as primary pollution by impurities, sorting and crushing, It is almost impossible to recycle itself.

In the present invention, in order to solve this problem, the EPDM is crushed in a frozen state and is processed to be recycled by processing into powder of 100 mesh.

When crushed in such a frozen state, scattering of the crushed product is blocked, preventing primary contamination, and difficulty in screening and crushing.

The EPDM should be added in an amount of 30 to 37 parts by weight. If it exceeds 37 parts by weight, the resistance to plastic deformation sharply decreases. If the amount of EPDM is less than 32 parts by weight, uniform adhesion, cold resistance and weatherability are deteriorated.

In addition, the EVA is a polymer in an intermediate state of rubber and plastic, and is added to suppress plastic deformation and surface peeling due to moisture in the asphalt.

The above SBS and SBR are as described above.

Further, in the present invention, in order to prevent the coarsening of the texture of the modified asphalt binder for high temperature, to increase the abrasion resistance of the surface, to strengthen the impact resistance, and to achieve the long life of the asphalt pavement by increasing the heat radiation property, 10 parts by weight of polyvinylpyrrolidone copolymer, 4 parts by weight of 9-ethylcarbazole-3-aldehyde-N, N-diphenylhydrazole, 8 parts by weight of polyoxyalkylene triol, , And 10 parts by weight of boron nitride.

In this case, the polyvinylpyrrolidone copolymer inhibits the coarse growth of the crystals contained in the composition, thereby contributing to suppressing cracking, peeling, and pothole generation of the asphalt surface layer.

In addition, the 9-ethylcarbazole-3-aldehyde-N, N-diphenylhydrazole enhances the anti-cracking property while enhancing abrasion resistance of the surface depending on slipability as well as water repellency.

The polyoxyalkylene triols have a function as a foam stabilizer and improve the binding power by increasing the crosslinking property and improve the impact resistance.

In addition, the boron nitride has a high thermal conductivity and effectively reflects heat to maintain heat dissipation, thereby contributing to stabilization of the asphalt surface layer.

Meanwhile, in the present invention, a specific material may be further added to the high-temperature modified asphalt binder to convert it into a modified high-temperature asphalt binder.

For example, according to the present invention, a modified high-temperature asphalt binder can be made by mixing a wax compound with the high-temperature modified asphalt binder.

This is because the wax compound that maintains the liquid form at room temperature acts to soften the viscosity of the high-temperature modified asphalt binder at a middle temperature (110-130 ° C) to soften while increasing the moisture resistance.

For this purpose, the wax compound is preferably mixed with the high temperature modified asphalt binder at a weight ratio of 2: 8.

The wax compound was prepared by adding 15-23% by weight of paraffin wax, 10-15% by weight of PE (polyethylene) wax, 3-5% by weight of bio oil and the rest of toluene into a reaction vessel and adding toluene having a boiling point of 110 ° C It is a compound obtained by heating the reaction tank to evaporate.

Here, it is better to stir at 5000-7000 rpm for 90 minutes using a high shear mixer for high viscosity so as to increase the reaction efficiency.

In addition, to the asphalt mixture containing aggregates satisfying 13 mm and 20 mm synthetic granularity, 4.4-6.5 parts by weight of the high-temperature modified asphalt binder prepared above was further added based on 100 parts by weight of the asphalt mixture to make a high-temperature modified asphalt mixture .

In this case, the asphalt mixture is a general asphalt mixture.

In addition, in the present invention, 9.5 to 16.0 parts by weight of the modified high-temperature asphalt binder prepared above based on 100 parts by weight of the asphalt mixture is further added to the asphalt mixture containing the aggregates satisfying the composite sizes of 13 mm and 20 mm, Modified asphalt mixtures can also be made.

Hereinafter, examples will be described.

[Example 1]

30 parts by weight of low-density polyethylene, 34 parts by weight of EPDM, 8 parts by weight of EVA, 18 parts by weight of SBS and 10 parts by weight of SBR were prepared based on 100 parts by weight of AP-5.

In order to confirm the high-temperature compatibility grade of the high-temperature modified asphalt binder according to Example 1, the compatibility level of the asphalt according to KS F 2389 was confirmed. The results are shown in Tables 1 and 2 below, and PG 76-22, PG All 82-22 grades were satisfied.

Test Items unit Test result  G * / sin δ at 76 ° C (Original) kPa 3.24  G * / sin? At 76 ° C (after RTFO) kPa 2.96  G * / sin < / RTI > at 31 C (after PAV) kPa 1,680  Stiffness at -12 ℃ MPa 176  m-value at -12 C - 0.32  flash point ℃ 342  Viscosity (135 ° C) Pa · s 2.4  Mass loss (after RTFO) % -0.09

Test Items unit Test result  G * / sin δ at 82 ° C (Original) kPa 1.27  G * / sin? At 82 ° C (after RTFO) kPa 2.32  G * / sin < / RTI > at 31 C (after PAV) kPa 2,740  Stiffness at -12 ℃ MPa 201  m-value at -12 C - 0.31  Viscosity (135 ° C) Pa · s 1.8

[Example 2]

The wax compound was prepared by mixing 20% by weight of paraffin wax, 20% by weight of PE (polyethylene) wax, and 20% by weight of paraffin wax by mixing the wax compound at a weight ratio of 8: 2 to the high temperature modified asphalt binder of Example 1 at a weight ratio of 8: 12 wt%, bio-oil 4 wt%, and the remaining toluene were placed in a reaction tank, and the reaction tank was heated so that all the toluene was evaporated.

In order to confirm the semi-high-temperature compatibility grade of the modified high-temperature asphalt binder according to Example 2, the compatibility rating of the asphalt according to KS F 2389 was confirmed. The results are shown in Tables 3 and 4 below, and PG 70-22 , And PG 76-22, respectively.

Test Items unit Test result  G * / sin δ at 70 ° C (Original) kPa 1.48  G * / sin? At 70 ° C (after RTFO) kPa 2.53  G * / sin < / RTI > at 28 C (after PAV) kPa 4,080  Stiffness at -12 ℃ MPa 236  m-value at -12 C - 0.32  flash point ℃ 0  Viscosity (135 ° C) Pa · s 1.3  Mass loss (after RTFO) % -0.06

Test Items unit Test result  G * / sin δ at 76 ° C (Original) kPa 1.29  G * / sin? At 76 ° C (after RTFO) kPa 2.41  G * / sin < / RTI > at 31 C (after PAV) kPa 2,790  Stiffness at -12 ℃ MPa 193  m-value at -12 C - 0.34  flash point ℃ 338  Viscosity (135 ° C) Pa · s 1.4  Mass loss (after RTFO) % -0.08

[Example 3]

In order to confirm the high temperature fluidity and high-temperature and low-noise properties of the asphalt mixture prepared by using the high-temperature modified asphalt binder obtained in Example 1, 20 mm and 13 mm synthetic granular aggregates specified in KS F 2377 were each formulated and designed 5.0 parts by weight of the high temperature modified asphalt binder of Example 1 was added to make an asphalt mixture.

The fluidity and high-temperature low-noise properties of the asphalt mixture were evaluated and are shown in Tables 5 and 6, respectively.

Test Items 20mm 13mm Marshall stability (N)
Flow value (1 / 10mm)
Porosity (%)
Saturation (%)
Tensile strength ratio (TSR)
Dynamic Stability (times / mm)
Toughness (N.mm)
Indirect Tensile Strength (MPa) 11,532
33
5
81
0.84
4,566
13,890
1.10 15,973
39
4
79
0.80
4,172
16,421
1.55

Test Items 20mm 13mm Marshall stability (N)
Flow value (1 / 10mm)
Porosity (%)
Aggregate porosity (%)
Tensile strength ratio (TSR)
Dynamic Stability (times / mm)
Losing Rate (%) 7,861
38
16
22.2
0.89
4,335
11 8,118
38
16
22.3
0.86
4,490
13 Slip resistance (BPN)
Noise reduction effect (dB) 67
5.3 51
- Toughness (N.mm)
Indirect Tensile Strength (MPa) 10,715
1.06 10,128
0.90

As shown in Tables 5 and 6, the flow values are within the specified range, and the fluidity at high temperature is satisfied. Also, the sliding resistance is within the specification range, and the high temperature and low noise characteristics are also satisfied.

[Example 4]

The 20mm and 13mm synthetic grain size aggregates specified in KS F 2377 were mixed and designed to confirm the quasi-high temperature fluidity and low-temperature low-noise performance of the asphalt mixture prepared using the modified high-temperature asphalt binder obtained in Example 2, 12.0 parts by weight of the modified high-temperature asphalt binder of Example 2 was added thereto to form an asphalt mixture.

The fluidity and quasi-high-temperature and low-noise properties of the asphalt mixture were evaluated in Table 7 and Table 8, respectively.

Test wood 13mm 20mm Marshall stability (N) 10,130 11,255 Flow value (1 / 10mm) 34 36 Porosity (%) 4 5 Tensile strength ratio (TSR) 0.82 0.80 Dynamic Stability (times / mm) 3,035 3,034 Toughness (N · mm) 11,121 11,198 Indirect Tensile Strength (MPa) 1.12 1.13 Interval ratio (%) 16.7 16.5

Test Items 13MM  10MM Marshall stability (N) 7,868 7,852 Flow value (1 / 10mm) 30 34 Porosity (%) 15 16 Aggregate porosity (%) 25.0 25.6 Tensile strength ratio (TSR) 0.86 0.87 Dynamic Stability (times / mm) 3,594 3,889 Cantabro loss rate (%) 9 10 Toughness (N · mm) 9,341 9,589 Indirect Tensile Strength (MPa) 0.83 1.00 Slip resistance (BPN) 59 65

As shown in Tables 7 and 8, it was confirmed that the fluidity in the high temperature range satisfying the flow range satisfies the high temperature and low noise characteristic that the sliding resistance falls within the specification range.

Claims (4)

A high temperature modified asphalt binder for use in a temperature range exceeding 130 캜,
25 to 32.5 parts by weight of low-density polyethylene, 30 to 37 parts by weight of EPDM, 5 to 8 parts by weight of EVA, 15 to 20 parts by weight of SBS and 8 to 12 parts by weight of SBR were mixed with 100 parts by weight of AP-5 ,
10 parts by weight of polyvinylpyrrolidone copolymer based on 100 parts by weight of AP-5, 4 parts by weight of 9-ethylcarbazole-3-aldehyde-N, N-diphenylhydrazole, And 10 parts by weight of boron nitride are further added and mixed to obtain a modified asphalt binder.
The method according to claim 1,
The modified high-temperature asphalt binder is mixed with a wax compound at a weight ratio of 8: 2 to prepare a modified high-temperature asphalt binder having a temperature range of 110 to 130 ° C,
The wax compound is prepared by adding 15-23% by weight of paraffin wax, 10-15% by weight of PE (polyethylene) wax, 3-5% by weight of bio oil and the remaining toluene into a reaction tank to evaporate all the toluene having a boiling point of 110 ° C Wherein the modified asphalt binder is a compound obtained by heating a reaction tank.
A high-temperature modified asphalt mixture produced by using the high-temperature modified asphalt binder according to claim 1,
Wherein the high temperature modified asphalt binder is further added in an amount of 4.4 to 6.5 parts by weight based on 100 parts by weight of the asphalt mixture to an asphalt mixture containing aggregates satisfying the synthetic granularity of 13 mm and 20 mm. Asphalt mixtures made with modified asphalt binder.
A modified asphalt mixture for semi-high temperature produced by using the modified high-temperature asphalt binder according to claim 2,
And 9.5 to 16.0 parts by weight of the modified high-temperature asphalt binder is further added to the asphalt mixture containing aggregates satisfying the composite particle sizes of 13 mm and 20 mm based on 100 parts by weight of the asphalt mixture. Asphalt mixtures prepared with modified asphalt binder.